What suggestions to control emergency charging of a LA battery bank using a BMV?
It’s a precautionary step to charge the batteries from mains in the event of the voltage being too low due to low PV yield.
You can program the relay in the BMV to close at a certain SOC. Don’t ask the details, I will have to google them and there’s no point in doing that twice 
I know it can be done. Technically you can do whatever you want with that relay signal, including running a charger.
I didn’t know it had a relay…
I checked the Victron documentation but couldn’t find any details.
Please refer me to the relevant docs.
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Many thanks!